Para lograr la transmisión a larga-distancia de señales de video en cables de-par trenzado, se debe realizar amplificación y compensación. El equipo de transmisión de vídeo de par trenzado-completa esta función. Después de agregar un par de equipos transceptores de video de par trenzado, la imagen se puede transmitir de 1 a 2 km. Si se utiliza el método de retransmisión, la distancia de transmisión se puede duplicar y la calidad de la imagen transmitida puede ser comparable a la del transceptor óptico. El precio de los equipos de transmisión de video par trenzado y par trenzado es muy económico, no solo no aumenta el costo del sistema, sino que su costo es mucho menor que el del cable coaxial cuando aumenta la distancia. Por lo tanto, el uso de transmisión de par trenzado en el sistema de monitoreo tiene ventajas obvias:
1. Larga distancia de transmisión y alta calidad de transmisión.
Due to the advanced processing technology used in the twisted pair transceiver, the attenuation of the video signal amplitude of the twisted pair pair and the attenuation difference between different frequencies are perfectly compensated, and the brightness and color of the original image and the real-time performance are maintained. When the transmission distance reaches 1km or more, the image signal is basically free of distortion. If the relay method is used, the transmission distance will be longer.
2. El cableado es conveniente y la tasa de utilización del cable es alta.
A pair of ordinary telephone lines can be used to transmit video signals. In addition, any pair of Category 5 unshielded twisted-pair cables widely laid in buildings can transmit one video signal without additional wiring. Even re-wiring, Category 5 cables are easier than coaxial cables. In addition, there are 4 pairs of twisted pairs in a Category 5 cable. If one pair of wires is used to transmit video signals, the other pairs of wires can also be used to transmit audio signals, control signals, power supply or other signals, improving the cable performance. Utilization rate, while avoiding the trouble caused by the separate wiring of various signals, reducing the engineering cost.
3. Gran capacidad anti-interferencia.
The twisted pair can effectively suppress common mode interference, and even in a strong interference environment, the twisted pair can transmit excellent image signals. Moreover, several pairs of twisted pairs in one cable are used to transmit different signals respectively, and there will be no interference with each other.
4. Alta fiabilidad y fácil de usar.
Using twisted pair to transmit video signal, a dedicated transmitter should be connected to the front end, and a dedicated receiver should be connected to the control center. This twisted pair transmission equipment is cheap and easy to use. It does not require professional knowledge and does not require much operation. It can be installed once and can work stably for a long time.
The price is cheap and the materials are convenient.
Since the common Category 5 unshielded cables or common telephone lines that are widely used are used, it is easy to purchase and the price is very cheap, which brings great convenience to engineering applications.
